Astronaut Buzz Aldrin poses with the Congressional Gold Medal inside the Rotunda of the U.S. Capitol November 16, 2011 in Washington, DC. (Olivier Douliery/Abaca Press/MCT)

Astronaut Buzz Aldrin poses with the Congressional Gold Medal inside the Rotunda of the U.S. Capitol November 16, 2011 in Washington, DC. (Olivier Douliery/Abaca Press/MCT)

Photo: Olivier Douliery

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Neil Armstrong and Buzz Aldrin on the Moon (NASA)

Neil Armstrong and Buzz Aldrin on the Moon (NASA)

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Astronauts John Glenn (L) and Michael Collins shake hands as Buzz Aldrin's wife, Annie (L), looks on before the start of a memorial for astronaut Neil Armstrong on September 13, 2012 at the National Cathedral in Washington, DC. Armstrong, the first man to set foot on the moon, died August 25 at the age of 82. AFP PHOTO/Mandel NGANMANDEL NGAN/AFP/GettyImages

Astronauts John Glenn (L) and Michael Collins shake hands as Buzz Aldrin's wife, Annie (L), looks on before the start of a memorial for astronaut Neil Armstrong on September 13, 2012 at the National Cathedral

This image provided by Bezos Expeditions shows a thrust chamber of an Apollo F-1 engine on the bottom of the Atlantic Ocean in March 2013. An expedition led by Amazon CEO Jeff Bezos pulled up two rocket engines, including this one, that helped boost Apollo astronauts to the moon. Bezos and NASA announced the recovery on Wednesday, March 19, 2013. The sunken engines were part of the Saturn V rocket used to bring astronauts to the moon during the 1960s and 1970s. After liftoff, they fell into the ocean as planned. (AP Photo/Bezos Expeditions)

This image provided by Bezos Expeditions shows a thrust chamber of an Apollo F-1 engine on the bottom of the Atlantic Ocean in March 2013. An expedition led by Amazon CEO Jeff Bezos pulled up two rocket

An undated handout image of Buzz Aldrin next to the American flag, photographed by Neil Armstrong. Trimmings leftover from the flag collected by Thomas Moser, a mechanical engineer who was put in charge of designing the flag for the Apollo 11 mission, is expected to bring $100,000 at auction. (NASA via The New York Times) -- EDITORIAL USE ONLY --

An undated handout image of Buzz Aldrin next to the American flag, photographed by Neil Armstrong. Trimmings leftover from the flag collected by Thomas Moser, a mechanical engineer who was put in charge of

FILE - In this 1969 photo provided by NASA the crew of the Apollo 11 mission is seen. From left are Neil Armstrong, Mission Commander, Michael Collins, Lt. Col. USAF, and Edwin Eugene Aldrin, also known as Buzz Aldrin, USAF Lunar Module pilot. The family of Neil Armstrong, the first man to walk on the moon, says he has died at age 82. A statement from the family says he died following complications resulting from cardiovascular procedures. It doesn't say where he died. Armstrong commanded the Apollo 11 spacecraft that landed on the moon July 20, 1969. He radioed back to Earth the historic news of "one giant leap for mankind." Armstrong and fellow astronaut Edwin "Buzz" Aldrin spent nearly three hours walking on the moon, collecting samples, conducting experiments and taking photographs. In all, 12 Americans walked on the moon from 1969 to 1972. (AP Photo/NASA)

FILE - In this 1969 photo provided by NASA the crew of the Apollo 11 mission is seen. From left are Neil Armstrong, Mission Commander, Michael Collins, Lt. Col. USAF, and Edwin Eugene Aldrin, also known as

Next month at Johnson Space Center you will have a chance to meet Buzz Aldrin, two of the last living members of the Apollo 11 mission, which saw the first manned lunar landing in human history.

Aldrin is the second man to ever walk on the Moon, and that is him in those iconic photos from the surface of the Moon.

Aldrin will be at the JSC signing his newest book, "Mission to Mars: My Vision for Space Exploration" on June 21 at 11 a.m.

Astronauts Aldrin, Neil Armstrong, and Michael Collins made up the Apollo 11 crew, which saw Armstrong and Aldrin both walk on the Moon, on July 20 and 21 in 1969. They collected nearly 50 pounds of rocks on the lunar surface, with Collins piloting the command spacecraft above them.

Armstrong died late last summer at the age of 82.

With the advancing age of the surviving NASA astronauts -- John Glenn is 91 -- opportunities are getting scarce to meet the men who pioneered manned spaceflight. Aldrin himself is 83 years old.